 New York State Route 420 | ||||
|---|---|---|---|---|
 Map of northeastern St. Lawrence County with NY 420 highlighted in red and NY 970B in blue | ||||
| Route information | ||||
| Maintained by NYSDOT | ||||
| Length | 11.92 mi[1] (19.18 km) | |||
| Existed | 1930[2]–present | |||
| Major junctions | ||||
| South end |  US 11 in Stockholm | |||
| North end |  NY 37 in Massena | |||
| Location | ||||
| Country | United States | |||
| State | New York | |||
| Counties | St. Lawrence | |||
| Highway system | ||||
| ||||
New York State Route 420 (NY 420) is a north–south state highway in St. Lawrence County, New York, in the United States. The southern terminus of the route is at an intersection with U.S. Route 11 (US 11) in the town of Stockholm. Its northern terminus is at a junction with NY 37 in the village of Massena. NY 420 passes through undeveloped regions of St. Lawrence County for most of its routing and briefly overlaps with NY 11C in the hamlet of Winthrop.
NY 420 was originally part of Route 32, an unsigned legislative route created by the New York State Legislature in 1908. The Winthrop–Massena portion of Route 32 became part of the signed NY 56 in the mid-1920s; however, NY 56 was realigned in 1927 to follow a new alignment well to the south of Winthrop. The former routing of NY 56 between Winthrop and Massena was redesignated as NY 420 as part of the 1930 renumbering of state highways in New York. NY 420 was extended southward to its current terminus south of Winthrop in 1980.